Byrna,
They received two warnings:
i)EGPWS
ii)Stick-shaker
If a RA fails,an amber annunciation appears on the PFD.As it didnt fail,there was no warning.If the pilot connected the EGPWS warning to the RA erroneous reading,thats only half the battle.He must know the implications of the erroneous reading for his approach.For this he has the MEL(O) data (but the #1RA failure hasnt been officially tagged) so he now has to rely on his own systems knowledge.
There were 3 more cues,2 visual,1 tactile.
i)RETARD instead of MCP SPD in FMA(top left PFD)-missable
ii)Decaying speed on speedtape(fly the plane!this after all is the only cue you really need...)
iii)Thrust levers at idle stop(tactile IF the PF has his hands on the levers)